#ifndef _LOG_HPP_
#define _LOG_HPP_

#include <iostream>
#include <string>
#include <cstdio>
#include <sstream>
#include <fstream>
#include <memory>
#include <ctime>
#include <unistd.h>
#include "Mutex.hpp"
#include<filesystem>

namespace LogModule
{
    using namespace MutexModule;

    const std::string gsep = "\r\n";
    // 刷新策略：1.向显示器打印 2.向指定文件打印
    // 刷新策略基类
    class LogStrategy
    {
    public:
        ~LogStrategy() = default;
        virtual void Synclog(const std::string &message) = 0;
    };

    // 向显示器打印
    class ConsoleLogStrategy : public LogStrategy
    {
    public:
        ConsoleLogStrategy()
        {
        }

        void Synclog(const std::string &message) override
        {
            LockGuard lockguard(_mutex);
            std::cout << message << gsep;
        }

        ~ConsoleLogStrategy()
        {
        }

    private:
        Mutex _mutex;
    };

    // 向指定文件进行打印
    const std::string defaultpath = "/var/log";
    const std::string defaultfile = "my.log";
    class FileLogStrategy : public LogStrategy
    {
    public:
        FileLogStrategy(const std::string &path = defaultpath, const std::string &file = defaultfile)
            : _path(path), _file(file)
        {
            LockGuard lockguard(_mutex);
            if (std::filesystem::exists(_path))
            {
                return;
            }
            try
            {
                std::filesystem::create_directories(_path);
            }
            catch (const std::filesystem::filesystem_error &e)
            {
                std::cerr << e.what() << '\n';
            }
        }

        void Synclog(const std::string &message) override
        {
            LockGuard lockguard(_mutex);
            std::string filename = _path + (_path.back() == '/' ? "" : "/") + _file;
            std::ofstream out(filename, std::ios::app); // 追加打开
            if (!out.is_open())
            {
                return;
            }
            out << message << gsep;
            out.close();
        }

        ~FileLogStrategy()
        {
        }

    private:
        std::string _path;
        std::string _file;
        Mutex _mutex;
    };

    // 形成一条完整的日志&&根据上面的策略选择不同的刷新方式
    // 1.形成日志等级
    enum class LogLevel
    {
        DEBUG,
        INFO,
        WARNING,
        ERROR,
        FATAL
    };

    std::string LeveltoStr(LogLevel level)
    {
        switch (level)
        {
        case LogLevel::DEBUG:
            return "DEBUG";
        case LogLevel::INFO:
            return "INFO";
        case LogLevel::WARNING:
            return "WARNING";
        case LogLevel::ERROR:
            return "ERROR";
        case LogLevel::FATAL:
            return "FATAL";
        default:
            return "UNKNOWN";
        }
    }

    std::string GettimeStamp()
    {
        time_t curr = time(nullptr);
        struct tm curr_tm;
        localtime_r(&curr, &curr_tm); // 输出型参数
        char timebuffer[128];
        snprintf(timebuffer, sizeof(timebuffer), "%4d-%02d-%02d %02d:%02d:%02d",
                 curr_tm.tm_year + 1900,
                 curr_tm.tm_mon + 1,
                 curr_tm.tm_mday,
                 curr_tm.tm_hour,
                 curr_tm.tm_min,
                 curr_tm.tm_sec);

        return timebuffer;
    }

    // 根据不同的方式完成刷新
    class Logger
    {
    public:
        Logger()
        {
            EnableConsoleLogStrategy();
        }

        void EnableFileLogStratrgy()
        {
            _fflush_strategy = std::make_unique<FileLogStrategy>();
        }

        void EnableConsoleLogStrategy()
        {
            _fflush_strategy = std::make_unique<ConsoleLogStrategy>();
        }

        class LogMessage
        {
        public:
            LogMessage(LogLevel &level, std::string &src_name, int line_number, Logger &logger)
                : _curr_time(GettimeStamp()), _level(level), _pid(getpid()), _src_name(src_name), _line_number(line_number), _logger(logger)
            {
                std::stringstream ss;
                ss << "[" << _curr_time << "]"
                   << "[" << LeveltoStr(_level) << "]"
                   << "[" << _pid << "]"
                   << "[" << _src_name << "]"
                   << "[" << _line_number << "]"
                   << "-";
                _loginfo = ss.str();
            }

            template<typename T>
            LogMessage &operator<<(const T &info)
            {
                std::stringstream ss;
                ss<<info;
                _loginfo +=ss.str();
                return *this;
            }

            ~LogMessage()
            {
                if(_logger._fflush_strategy)
                {
                    _logger._fflush_strategy->Synclog(_loginfo);
                }
            }

        private:
            std::string _curr_time;
            LogLevel _level;
            pid_t _pid;
            std::string _src_name;
            int _line_number;
            std::string _loginfo; // 合并之后的一条完整信息
            Logger &_logger;
        };

        LogMessage operator()(LogLevel level,std::string name,int line)
        {
            return LogMessage(level,name,line,*this);
        }

        ~Logger()
        {

        }

    private:
        std::unique_ptr<LogStrategy> _fflush_strategy;
    };

    Logger logger;

    #define LOG(level) logger(level,__FILE__,__LINE__)
    #define Enable_Console_Log_Strategy() logger.EnableConsoleLogStrategy()
    #define Enable_File_Log_Strategy() logger.EnableFileLogStratrgy()

}

#endif